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Finding the Fourth Proportional to 139.22, 191.86 and 117.11

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Solution

The fourth proportional to 139.22, 191.86 and 117.11 is: 161.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.22 : 191.86 = 117.11 : x
  2. Step 2: Convert to fraction form
    139.22/191.86 = 117.11/x
  3. Step 3: Cross multiply
    139.22x = 191.86 × 117.11
  4. Step 4: Simplify right side
    139.22x = 22,468.91
  5. Step 5: Solve for x
    x = 22,468.91/139.22
  6. Step 6: Final answer
    x = 161.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.